* {
  margin: 0;
  padding: 0;
}




.tab {

  width: 100%;
  min-width: 1200px;
  min-height: 620px;
  height: auto;
  margin-top: 300px;
  background: url(../images/use1.jpg) no-repeat center top;


  border: 1px solid #e4e4e4;

}

h1 {
  display: block;
  text-align: center;

  border-bottom: 3px solid #D4D4D4;
}

.tab-nav {
  width: 100%;
  height: 60px;
  line-height: 60px;
  border-bottom: 3px solid #D4D4D4;
}


.tab-nav ul {
  list-style: none;
  display: flex;
  justify-content: space-around;
}

.tab-nav ul li {
  margin: 0 20px;
  font-size: 20px;

}

.tab-nav ul li a {
  text-decoration: none;
  border-bottom: 2px solid transparent;
  color: #333;
}

.tab-nav ul li a.active {
  border-color: skyblue;
  color: skyblue;
}

.tab-content {
  padding: 0 16px;
  width: 1300px;
  margin: 0 auto;
}

.tab-content .item1 {
  display: none;
}

.tab-content .item1.active {
  display: block;
}

.item1.active img {
  display: block;
  height: auto;
  width: 100%;
  height: 100%;

}

.contain1 {
  display: flex;
  justify-content: space-between;
}

.skills {
  display: flex;
  flex-direction: column;
  width: 40%;
  height: auto;
  background-color: #f2f2f2;
  padding: 20px;

}

.skills ul {
  display: flex;
  justify-content: space-around;
  flex-wrap: wrap;
  list-style: none;
  margin: 0;
  padding: 0;
}

.skills li {
  flex: 0 0 25%;
  /* 每行显示四个，占据四分之一的宽度 */
  margin: 10px;

}

.skills img {
  width: 100% !important;
  height: auto !important;
  border: 2px solid skyblue;
  border-radius: 20% 0 20% 0;

}

.introduction {
  width: 50%;
  background-color: #fff;
  padding: 20px;
}

.introduction img {
  max-width: 100%;
  height: auto;
}

body {
  height: 2000px;
  font-family: Arial, sans-serif;
  background-color: #f4f4f4;
}

/* 评论区 */
.wrapper {
  padding-left: 20%;
  padding-top: 30px;
  min-width: 400px;
  max-width: 800px;
  display: flex;
  justify-content: flex-end;
}

.avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  overflow: hidden;
  background: url(../images/sign.png) no-repeat center / cover;
  margin-right: 15px;
}

.wrapper textarea {
  outline: none;
  border-color: #b7b9c1;
  resize: none;
  background: #f5f5f5;
  border-radius: 4px;
  /* 可伸缩 */
  flex: 1;
  padding: 10px;
  /* //平滑过渡 */
  transition: all 0.5s;
  height: 30px;
}

.wrapper textarea:focus {
  border-color: #b7b9c1;
  background: #fff;
  height: 50px;
}

.wrapper button {
  background: #00aeec;
  color: #fff;
  border: none;
  border-radius: 4px;
  margin-left: 10px;
  width: 70px;
  cursor: pointer;
}

.wrapper .total {
  margin-right: 80px;
  color: #999;
  margin-top: 5px;
  opacity: 0;
  transition: all 0.5s;
}

.list {
  min-width: 400px;
  max-width: 800px;
  display: flex;


  border-radius: 5px;
}

.list .item {
  width: 100%;
  display: flex;
}

.list .item .info {
  flex: 1;
  border-bottom: 1px dashed #e4e4e4;
  padding-bottom: 10px;
}

.list .item p {
  margin: 0;
}

.list .item .name {
  color: #FB7299;
  font-size: 14px;
  font-weight: bold;
}

.list .item .text {
  color: #333;
  padding: 10px 0;
}

.list .item .time {
  color: #999;
  font-size: 12px;
}

.all-nav {
  margin-top: 0px !important;

}

.all-nav .navb {
  margin-top: 0px;
}

.all-nav .navb ul {

  margin-left: 25%;
}

.all-nav .navb li {
  width: 130px;
}

.ajax {
  top: 50px !important;
}